Average and Constant Acceleration Chapter 2. Acceleration.

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Presentation transcript:

Average and Constant Acceleration Chapter 2

Acceleration

0 – 60 mph in 2.9 s0 – 60 mph in 3.1 s 0 – 60 mph in 3.0 s

Acceleration

DEFINITION OF AVERAGE ACCELERATION Calculate the average acceleration of a plane if, starting from rest, it reaches the speed of 260 km/h within 29 seconds.

GIVENUNITSEQUATIONS SUBSTITUTE / SOLVE

Calculate the average acceleration of a sports car if at t = 9s it is moving at the speed of 28 m/s and at t = 12 s it reaches the speed of 13 m/s. GIVENUNITSEQUATIONS SUBSTITUTE / SOLVE

Is a<0 always ‘slowing down’? If going north is positive, how would you express the velocity of a car that is travelling south with a speed of 12 m/s? Suppose the car accelerates to 25 m/s in 5 seconds, what is the acceleration? Is the acceleration positive or negative? Answer the question in the header…

For constant acceleration ONLY!

Example One car is traveling at 15 m/s steadily for 8 seconds. Another car accelerates from rest to with an acceleration of 2.6 m/s 2 for 8.0s. a)Which car will have a greater velocity at the end of 8.0 s? b)Which car will have a greater average velocity over 8.0 s time period? c)Which car will have traveled a greater distance?

Does this provide acceleration?